Warp-stop mechanism for looms



Dec. 28', 1926.

i. SNOW WARP STOP MECHANISM FOR LOOMS 2 Sheets-Sheet Filed July 19, 1926 MENTOR I QZQa-H/ I Li A O fF/VEY Dec. 28, 1926. 1,611,958

I. sNow WARP STOP MECHANISM FOR LOOMS Filed y 19, 1926 2 Sheets-Sheet 2 16 I 4 1 E- 3 Ff I? BY I ATTORNEY Patented Dec. 28, 1926.

UNITED STATES PATENT oFFIcE.

ISAAC snow, or LAWRENCE, mnssacnusn'rrs, assrcivon' 'ro nnarnn CORPORATION, or nornnann, massacnusnr'rs, A CORPORATION or MAINE.

I WARP-STOP MECHANISM FOR LOOMS.

1 Application filed July 19, 1926. Serial 'No. 123,284.

This invention relates to warp stop mechanisms for looms and is more particularly directed to means for effecting. loom stoppage when a warp thread becomes either 6 broken or unduly tensioned.-

It is now the ordinary practice to supply. looms with a warp stop mechanism which is intended to stop the loom should a warp thread break or become too slack for 1 weavingpurposes. During the weaving operation it sometimes happens that one of the warp threads becomes crossed over other warp threads between the shedding mechanism and the fell of the cloth, with the result that the crossed-and'broken end of the warp thread will extend laterally of the loom and across other warp threads of one of the shed planes, and upon a change in the shed formation thecrossed thread will place undue tension upon other threads crossed by it and defective cloth will be woven.

One of thepurposes of the present invention, therefore, is to provide a warp stop "lnechanism with means for effecting loom stoppage when a warp thread (or warp threads) becomes unduly tensioned, or when,

. one of the warp threads breaks or becomes too slack for weaving purposes. In accordance with the present invention, the warp so stop mechanism is of the type wherein a toothed detector bar is given a movement transversely of the, loom and upon the oc-- currence of ,a broken or too slack warp thread, the detector bar movements are arrested by a drop wire. The means for effectingthetransverse movement of the detector bar maybe variously contrived'and the par ticular details thereof form no essential part of the present invention.

The dro to Th invention and new features thereof,

'elfect loom stoppage when .a.

unduly raised.

wires are normally'supported by the warp t ireads during weaving, and assoand novelcombination of parts, will best be made clear from the followingv description and the accompanying drawings of one good form thereof.

In the, drawings: Fig. 1 is a perspective view of certain portions of a loom vprovided with the present invention; a

Fig. 2 is an enlarged detail showing more particularly the stop member and sto fin- 00 ger and their associated relation with the drop wires; I

Fig. 3 is a side elevation of the warp stop mechanism showing one good form of means for imparting transverse movements to the detector bar; and I F Fig. 41s a cross-section on the line 44 01 i .3. is now well understood, the purpose of a warp stop as now generally constructed is to stop the loom whenever a warp thread breaks and this functional operation is dependent upon the release of a drop wire by a broken or tooslack warp thread. 7 It may happen at times that the end of a broken warp thread will get crossed laterally of'the adjacent warp thread and be held taut during the shed formation, so that the warp stop mechanism may not be actuated by reason of the fact that the drop wire connected to thewarp thread is still held in raised position. This raisedcondition of the drop wire is utilized in the present invention to drop wire is s5 Themloom may be of-any usual construction and asshown in Fig. 1, it comprises the" usual frame 1, lay "2, shedding mechanism 3, warp beam 4, whip roll 5 over which the warp threads a pass from the warp beam' 9 through a warp stop mechanism, the shedding mechanismpthe lay reed, and on to the weaving point or fell of the cloth at 6. These parts may be of usual character.

.The warp stop mechanism'to which the present invention is more particularly directed comprises a detector bar having a'detecting movement in a direction transversel of the loom and a detector bar holder, bot

of said bars having teeth which are engaged.

by a drop wire when a warp thread breaks or becomes too slack for weaving purposes, to thereby stop the loom.

Mounted on the side supports secured to the loom frame, are the usual brackets 6, only one of which is shown in the present instance, and extending transversely of the loom and secured to the brackets 6 are the tion of which the warp threads (1 pass on their .way from thewarp beam to the shedding mechanism.

Rising from the brackets (l are the uprights 8 (Fig. 3) to which are secured by pins 9 the detector bar holders 10. In the present instance of the invention, the deteetor bar holder 10 is provided with two side members 11 and 12 between which is mounted the detector 13, and both the detector 13 and detector bar holder are provided with teeth 14 and 15, as usual in this general type of warp stop mechanism.

The detector bar holder at one side .is provided with an opening 16 (F ig. 3) through which projects a pin 17 engaged by a detector-bar actuator 18, the outer end portion of which is connected at 19 to the rocker arm 20. There will be as many detector bars, detector bar actuators and rocker arms 20 as there are banks of drop wires, and in the present instance of the invention two banks of drop wires are disclosed and consequently two detector bars and their actuating means.

The rocker arm 20, as indicated in Fig. 3, is mounted on the saddle 21 by means of the pins 22 which are held in their seats on the saddle by the spring 23. The train of mechanism for giving the detector bar its transverse movement and for effecting loom stoppage on the occurrence of a warp fault may be of any general type and is herein indicated as of the same general character as that of the patent to' Harry A. Davis and Arthur S. Johnson, No. 1,538,625, May 19, 1925, to which reference may be had for a detailed description of such mechanism.

The rocker arm 20 has associated therewith a finger 2t which projects above the sheathed flexible wire 25 (Fig. 3) with the result that should theisaddle 2Lcontinue to rock upon its supporting stud 26 While the rocker arm 20 is held stationaryfthe' finger 24 will press upon the flexible wire 25 and effect loom stoppage. As above explained, this train of mechanism may all be of any suitable type and is shown as like the similar train of mechanism in the Davis and J ohnson patent.

The drop wires 27 are each providedwith an elongated .slot 28 through which, in the present instance, pass the detector bar and detector. bar holder, as'indicated in Fig. 2, and as indicated, each drop Wire is provided with an eye 01' opening 29 through which passes a warp thread a, The particular the Davis and Johnson form or characterof drop wire is not of importance, except in so far as that it may 32 for securing the brackets in adjusted position.

Each of the brackets 30 is provided with a hearing 3-33 for a rock shaft 3 1 which extends transversely of the loom, as indicated'in Figs. 2 and 3. are the arms 35, one adjacent each side of the loom, and secured to the rock shaft 84 by'suitable means such as the bolts '36. Secured to and extending between the arms 35 is the stop member 37 which passes through the elongated opening 28 in the drop wires and extends transversely of the loom adjacent the lower terminal portion of the elongated slot 28 in each drop wire, the construction being such that should a drop wire be unduly raised by a warp thread, the stop member 37 will be correspondingly lifted by the drop wire, and advantage is taken of this operation to acutate means for effecting loom stoppage.

In the present instance, the rock shaft 34: has secured to one end thereof the hub portion 38 of a stop finger 39, the upper end portion 40 of which is normally out of the path of of movement of the detector bar-actuator 18, as indicated by full lines in Fig. 4. Y

Should one of thenvarp threads become broken or too slack for weaving purposes, the associated drop wire will fall and the upper portion thereof will enter between the teeth of the detector bar and detector bar jholder and, perforce, arrest the detectinL movement of the detector bar, and through the detector bar actuator 18. and train of mechanism eifect loom stoppage. The operation in this respect will be the same as in patent hereinbefore mentioned. i

Should one ofthe drop wires be abnormally raised by a warp thread, such as occurs when a. cross happens in the warp, the stop member 37 which passes through all of the drop wires will be lifted with the drop wire and, perforce, rock the shaft '34 thereby moving the upper end 40 of the stop finger 39 into the path of movement of the detector bar actuator 18 and arrest the movement of the detector bar to thereby stop the loom. The drop wires may be variously formed so far asthe present invention is concerned, the only essential being that there should be an elongated slot in the drop wire for the.

Extending from the rock shaft 34 the combinationof a series of 'drop wires bar and detector bar holder on the'occurence of a breakage or too slack warp thread, and the stop member 37 should occupy a osition adjacent the lower end portion of t e elongated slot when the drop wires are in normal supported position, so that ona lifting movement ofa drop wire due to a tensioned warp thread, the stop finger may be moved intoposition to stop the loom.

What is claimed-is:

1. In a warp stop mechanism for looms, the combination of a detecting bar having a detecting movement transversely of the loom and provided with teeth, a series of drop wires normally supported by the warp threads during weaving and adapted to arrest the movement of the detecting bar when a warp thread breaks or becomes too slack, a stop fingermounted for movement to andfromstopping position, and connections between the stop finger and drop wiresadapted to be moved by an unduly tensioned warp thread to impart movement to the stop finger into stopping position to arrest movement of the detecting bar when a drop wire is unduly raised.

2. In a warp'stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, adetector bar having a detecting movement transversely of the loom, a stop member passing through the drop wires and adapted to be lifted by any one of the drop wires when it is unduly raised by a tensioned warp thread, and a stop finger connected to the stop member and adapted to arrest the movement of the de tector bar when one of the ,drop' wires is 6 unduly raised by a warp thread.

3. In a warp stop mechanism for looms,

each provided with an elongated slot, a detector bar having at detecting movement transversely of the loom-and'adapted to be arrested b a fallen drop wire, a stop member exten ing through the drop wires and adapted to be lifted by anyone of the drop wires when a drop wire is abnormally raised,

and means actuated by the'stop member to stop the detector when-the stop member is abnormally raised.

4. In a warp stop mechanism forlooms, the combination of'a toothed detector bar havmg a movement transversely of the loom,

' a series of dropwires, a stop member extendmg through the drop wires and adapted to be llfted by a drop wire when it isunduly ,raised, and means actuated by the stop memberwhen 1t 15, unduly raised by a drop wire toeflect loom stoppage.

5. In a warp stop mechanism for looms, the combination of a toothed detectorbar having .a movement transversely of the 100m,

a series of drop wires, a stop member extending through the drop wires and adapted to be lifted b a series of drop wires normally supported by a warp thread, a stop member extending transversely of; the loom through the drop "wires and adapted to be lifted when any drop-wire is unduly raised, and means positioned by the stop member when it is undulylifted by a raised drop. wire to effect loom stoppage.

7. In a warp stop mechanism for looms,

the'combination of a toothed detector bar having a detecting movement transversely of the loom, a series of drop wires normally supported by the warp threads during weavng and adapted to arrest the movement of the detecting bar when a drop wirefails to be supported by a warp thread, a stop member extending transversely of the loom through the drop wires and adapted to be lifted when any drop wire is undul raised, and a stop finger operatively ositioned by the stopvmember when it is un uly lifted by 'a drop wire to effect loom stoppage.

8. In a warp stop mechanismfor looms,

the combination of a, series of drop wires each having an elongated slot, astop rod extending transversely of the loom through the elongated slots of the drop wires and adapted to be lifted when any one of the "dro wires is unduly raised, and means actulzy the stop rod when it is unduly lifted ate by a op wire to effect, loom stoppoge.

9. In a warp stop mechanism for looms, the combination of. a series of drop wires each having an elongated slot, a stop rod extending transversely of the loom through the elongated slots of the drop wires and adapted to be lifted when any one of the dro ate by 9.

wires is unduly raised, means actub the stop rod when it is unduly lifted d i'op wire to effect 'loom stoppage, and

means to effect loom stoppage when any dro wire is released by a broken or too slacl; warp thread. I

10. Ina warp stop mechanism for looms, the combination of a series of drop wires each having an elongated slot and normally supported by the war threads during weaving, a stop rod exten ing transversely of the loom through the elongated slots of the drop.

wires and adapted to be lifted when any one of the drop wires is abnormally raised, a rock shaft supporting the stop rod at one side of its longitudinal axis and adapted to be turned when the stop rod is abnormally.

raised, and means actuated from the rock shaft to stop the loom.

I 11 In a warp stop mechanism for looms, the combination of a series of drop wires each having an elongated slot and normally supported by the warp threads during weav-- ing, a stop rod extending transversely of the loom through the elongated slots of the drop wires and adapted to be lifted when any one of the drop wires is abnormally raised, a rock shaft supporting the stop rod at one side of its longitudinal axis and adapted to be turned when the stop rod is abnormally raised, and means including a stop finger actuated from the rock shaft to stop the loom.

12. In a warp stop mechanism for looms.

Lemme the combination of a series of drop wires each having an elongated slot and normally supported by the war threads during weaving, a stop rod exten ing transversely of the loom through the elongatedslots of the drop one of the drop wires is abnormally raised, a rock shaft supporting the stop rod at one side of its longitudinal axis and adapted to he turned when the stop rod is abnormally wires and adapted to be lifted when any raised, and means actuated from the rock 

